Mercury OB Economy "Feature"

[CDuke]

My '99 Mercury 125 OB has a "feature" where it runs on 2 cylinders when at low RPMs and kicks in all 4 cylinders at about 2000 RPMs. I find this annoying, as it makes it hard to run at mid-speed. <br /><br />Does anyone know if there is a way to override this feature? I think it would be cool to have a dash-mounted override switch.<br /><br />Thanks in advance for any help.<br /><br />Chip

 

[Laddies]

Re: Mercury OB Economy "Feature"

There is not a overide it is not electrical but done with the carbs, it is not a economy feature but gets the engine off the pipe so to speak and lets it idle

 

[CDuke]

Re: Mercury OB Economy "Feature"

Hmmm... So is it controlled by vacuum then?

 

[DHPMARINE]

Re: Mercury OB Economy "Feature"

Problem is 2 of your carbs don't have an idle circuit.You could replace the carbs,but very costly.<br /><br />DHP

 

[CDuke]

Re: Mercury OB Economy "Feature"

OK. I guess I get it... There's no easy fix. I'll keep living with it. Thanks for your help.<br /><br />Chip

 

[Laddies]

Re: Mercury OB Economy "Feature"

Chip, sometimes you can help the problem with a differant prop get the RPM at max. recomendation with the boat in average load condition